I have no idea if the following applies to this scale, but the TR crew found that the Tanita settings showed:
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Scale @ Regular = Approximate correlation with DEXA scans of Total Body Fat (subcutaneous, visceral, etc.)
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Scale @ Athlete = Approximate correlation with skin caliper body fat measurement (subcutaneous only)
If the above is true, it seems likely best to use the Regular setting to track your entire fat percentage and it’s relation to muscle mass and everything else.
See Nate’s original thread for a deeper dive and related discussion: